Malicious PDF — malware analysis report

Static analysis result for SHA-256 0496da473d82b29c…

MALICIOUS

PDF

96.6 KB Created: 2021-06-28 06:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8190f40699f414440ebcfe89b4de1aa2 SHA-1: e5afa67c62f269be6400abed36581d36af8b5730 SHA-256: 0496da473d82b29c10900314b31d706d22bb9fa0d5ab7d6f5b8ee6f68dc27fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=hypothermia+and+metabolic+acidosis
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4e873793f---385245941.pdf
    • http://lt101shop.com/userfiles/files/losivilubiropovafefovase.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/66535465857.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l55icldk0h264lvienusiv781i/pedimititenenig.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d75dea6f5e18f4f9b69e253e231f6eb4/89604342380.pdf
    • http://sevoir.hu/uploads/file/6534881856.pdf
    • https://sport-jicin.cz/dokumenty/70241064726.pdf
    • http://aostavet.it/userfiles/files/pawosumip.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/047397074b8b5267ab5abe32fc1aab33/65952993452.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/15d51b02f2a5790a1059f327dd354de8/82824827927.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a91cf6a2b70149603de8188a1a98dc9c/pogaderukuzor.pdf
    • https://allcreaturesinc.com/files/files/xabitas.pdf
    • https://patc.fr/imagesfile/xidiguk.pdf
    • https://bestrecycledautoparts.net/images_i/file/17682072680.pdf
    • https://pui-vital.ro/msg_media/file/gamulumalapovegu.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/46749596df168379e2855448d2dacdaa/39815227014.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f75719933---68609793661.pdf
    • http://airsoft1.ro/files/file/jewakebupuf.pdf
    • http://araonline.hu/uploads/file/volebagonimipexegoxiw.pdf
    • http://wooshin.kr/uploaded/file/92469141660a86329c148e.pdf
    • http://hopkinshigh1988.com/clients/75739/File/65492832461.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74a6bc5f46798b170e2f519d35790cec/28297714640.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46cf4643a6---36809513879.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16792 bytes
font_01_sfnt_off0001285a.bin
3244397c18cc94968367bbb99ca02381bbe47878e3cf1d8bc928322c89139f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 20068 bytes
font_02_sfnt_off00015c1f.bin
f5cb4ca7957304201ce69f77385a28c044dc904b945dd280f3d35044485e96fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1F 11024 bytes